--- title: "CVE-2011-3187\n | Ubuntu" description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/CVE-2011-3187?format=md keywords: index, follow --- # CVE-2011-3187 Publication date 29 August 2011 Last updated 24 July 2024 --- Ubuntu priority **Low** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) Toggle side navigation ## Description The to\_s method in actionpack/lib/action\_dispatch/middleware/remote\_ip.rb in Ruby on Rails 3.0.5 does not validate the X-Forwarded-For header in requests from IP addresses on a Class C network, which might allow remote attackers to inject arbitrary text into log files or bypass intended address parsing via a crafted header. [Read the notes from the security team](https://ubuntu.com/security/CVE-2011-3187?format=md#notes) ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | rails | 11.04 natty | Not affected | | 10.10 maverick | Not affected | | 10.04 LTS lucid | Not affected | | 8.04 LTS hardy | Ignored end of life | --- * [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) * [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses) ## Notes --- ### [mdeslaur](https://launchpad.net/~mdeslaur) looks like it's 3.x only ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-3187) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2011-3187) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2011-3187) * [Debian](https://security-tracker.debian.org/tracker/CVE-2011-3187) ### Other references * * *